Building Computer Vision Projects with OpenCV 4 and C++

OCR segmentation

First, we will obtain a plate image patch as an input to the OCR segmentation function with an equalized histogram. We then need to apply only a threshold filter and use this threshold image as the input of a Find contours algorithm. We can observe this process in the following image:

This segmentation process is coded as follows:

Mat img_threshold; threshold(input, img_threshold, 60, 255, CV_THRESH_BINARY_INV); if(DEBUG)     imshow("Threshold plate", img_threshold);     Mat img_contours;     img_threshold.copyTo(img_contours);     //Find contours of possibles characters     vector< vector< Point>> contours;  findContours(img_contours, contours, ...